Please help me

I have changed the settings hostnam .
Then left me a message from the Cpanel : Your license could not be activated

If you own a license and see any discrepancies, please contact cs@cpanel.net

Troubleshooting: If your license lists as active and you see this error when trying to access cPanel or WHM: License File Expired. Follow these steps:

Make sure running this command as root on the server gives the IP that you expect: lynx -dump http://www.cpanel.net/showip.cgi.
Run the following as root on the server: /usr/local/cpanel/cpkeyclt.
If you are still having troubles, please Open a Support Request.